maybe this problem is caused by the Training Gym Pro Software you are using.I managed to upload the track and see the trackline in GH-505 by using Sporttracks 2.1.GH-505 has made a Track-Back with 78 Softtrack-Back points out of it. It works very well!

@ Geoffrey: I also tried to import the gpx-file in Training-Gym Pro 1.5.2 but it didn´t work. It wasn´t saved in the database so I can´t select the track in the Training-Data window. But the trackline was shown in the map-window of training-gym-pro.

switched from ST3 to ST2, got GlobalsatDevicePlugin-v3.0.3847.st3plugin from gs-sports page, unpacked (with winrar) and stored it into \Sporttracks\Plugins folder, yet no GS-Sports (esp. gh505) device can be chosen as "my device". even though the preferences show a GS Device Plugin...this freaks me out.